Micro touch pen structure having a pen core unit with a stop portion

ABSTRACT

A micro touch pen structure includes a casing unit, a circuit unit, a first electromagnetic unit, a pen core unit, a second electromagnetic unit and an elastic unit. The circuit unit is disposed inside the pen-shaped casing structure. The first electromagnetic unit includes a first hollow electromagnetic body inside the pen-shaped casing structure and an electromagnetic coil wound around the first hollow electromagnetic body and electrically connected to the circuit unit. The pen core unit includes a first movable portion passing through the first hollow electromagnetic body, a second movable portion partially exposed from the pen-shaped casing structure, and a stop portion connected between the first and the second movable portions. The second electromagnetic unit includes a second hollowing electromagnetic body fixed inside the pen-shaped casing structure and disposed around the first movable portion. The elastic unit is disposed between the first movable portion and a fixed structure.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The instant disclosure relates to a micro touch pen structure, and moreparticularly to a micro touch pen structure having a stopper forstopping or retaining an electromagnet.

2. Description of Related Art

Conventional touch control devices may be classified into three types:resistive, electromagnetic and capacitive. Operation with a resistivetouch control device requires a rigid pen tip to apply a significantforce on the resistive touch control device in a very small area toaccomplish deformation of the resistive touch sensor, and anelectromagnetic touch control device requires a special battery poweredpen for input; while the working principle of a capacitive touch controldevice relies on capacitive coupling, which takes place as soon as thecapacitive touch sensor is touched by a conductive object, and the touchposition can then be identified according to the variation incapacitance at the touch point. Therefore, a capacitive touch controldevice does not require an input pen that consumes electricity. Nor isit necessary to subject a capacitive touch sensor to concentratedpressure application for deformation, and thus a capacitive touchcontrol device has a longer service life. Furthermore, mass productionof capacitive touch control devices requires lower costs due to itssimple construction, less components and higher yield rate.

A capacitive touch control device can be operated in many ways. The mostcommon of all is using a conductor, for example a finger or a pen, totouch or slide on the surface of the capacitive touch control device,for the capacitive touch sensor thereof to generate a response signal.However, as capacitive touch control devices find more and moreapplications, the lower precision on position detection tends to hindersmoothness of operation where more precise and more efficient detectionis required, such as in handheld devices. In order to enable enhancedprecision on position detection, many people choose to use pens forcapacitive touch input.

SUMMARY OF THE INVENTION

One aspect of the instant disclosure relates to a micro touch penstructure having a stopper for stopping or retaining an electromagnet.

One of the embodiments of the instant disclosure provides a micro touchpen structure, comprising: a casing unit, a circuit unit, a firstelectromagnetic unit, a pen core unit, a second electromagnetic unit andan elastic unit. The casing unit includes a pen-shaped casing structure.The circuit unit is disposed inside the pen-shaped casing structure. Thefirst electromagnetic unit is fixed inside the pen-shaped casingstructure and electrically connected to the circuit unit, wherein thefirst electromagnetic unit includes a first hollow electromagnetic bodyfixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit. The pen core unit ismovably disposed inside pen-shaped casing structure, wherein the pencore unit includes a first movable portion passing through the firsthollow electromagnetic body, a second movable portion partially exposedfrom the pen-shaped casing structure, and a stop portion connectedbetween the first movable portion and the second movable portion. Thesecond electromagnetic unit includes a second hollowing electromagneticbody fixed inside the pen-shaped casing structure and disposed aroundthe first movable portion, wherein the second hollowing electromagneticbody is abutted against the stop portion and disposed between the firstelectromagnetic unit and the stop portion. The elastic unit is disposedinside the pen-shaped casing structure and between the first movableportion and a fixed structure that is disposed inside the pen-shapedcasing structure.

Another one of the embodiments of the instant disclosure provides amicro touch pen structure, comprising: a casing unit, a circuit unit, afirst electromagnetic unit, a pen core unit, a second electromagneticunit and an elastic unit. The casing unit includes a pen-shaped casingstructure. The circuit unit is disposed inside the pen-shaped casingstructure. The first electromagnetic unit is fixed inside the pen-shapedcasing structure and electrically connected to the circuit unit, whereinthe first electromagnetic unit includes a first hollow electromagneticbody fixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit. The pen core unit ismovably disposed inside pen-shaped casing structure, wherein the pencore unit includes a first movable portion passing through the firsthollow electromagnetic body and a second movable portion connected tothe first movable portion and partially exposed from the pen-shapedcasing structure. The second electromagnetic unit includes a secondhollowing electromagnetic body fixed inside the pen-shaped casingstructure and disposed around the first movable portion, wherein thesecond hollowing electromagnetic body is disposed between the firstelectromagnetic unit and the second movable portion. The elastic unit isdisposed inside the pen-shaped casing structure and between the firstmovable portion and a fixed structure that is disposed inside thepen-shaped casing structure, wherein the elastic unit includes at leastone first elastic element adjacent to the first movable portion and atleast one second elastic element far away from the first movableportion, the at least one first elastic element and the at least onesecond elastic element are connected in series and between the firstmovable portion and the fixed structure, and the elastic coefficient ofthe at least one first elastic element is smaller than that of the atleast one second elastic element.

Yet another one of the embodiments of the instant disclosure provides amicro touch pen structure, comprising: a casing unit, a circuit unit, afirst electromagnetic unit, a pen core unit, a second electromagneticunit and an elastic unit. The casing unit includes a pen-shaped casingstructure. The circuit unit is disposed inside the pen-shaped casingstructure. The first electromagnetic unit is fixed inside the pen-shapedcasing structure and electrically connected to the circuit unit, whereinthe first electromagnetic unit includes a first hollow electromagneticbody fixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit. The pen core unit ismovably disposed inside pen-shaped casing structure, wherein the pencore unit includes a first movable portion passing through the firsthollow electromagnetic body, a second movable portion partially exposedfrom the pen-shaped casing structure, and a stop portion connectedbetween the first movable portion and the second movable portion. Thesecond electromagnetic unit includes a second hollowing electromagneticbody fixed inside the pen-shaped casing structure and disposed aroundthe first movable portion, wherein the second hollowing electromagneticbody is abutted against the stop portion and disposed between the firstelectromagnetic unit and the stop portion. The elastic unit is disposedinside the pen-shaped casing structure and between the first movableportion and a fixed structure that is disposed inside the pen-shapedcasing structure, wherein the elastic unit includes at least one firstelastic element adjacent to the first movable portion and at least onesecond elastic element far away from the first movable portion, the atleast one first elastic element and the at least one second elasticelement are connected in series and between the first movable portionand the fixed structure, and the elastic coefficient of the at least onefirst elastic element is smaller than that of the at least one secondelastic element.

Therefore, because the design of the pen core unit including a firstmovable portion passing through the first hollow electromagnetic body, asecond movable portion partially exposed from the pen-shaped casingstructure, and a stop portion connected between the first movableportion and the second movable portion, the second hollowingelectromagnetic body can be abutted against the stop portion forrestricting the position of the second hollowing electromagnetic body.

To further understand the techniques, means and effects of the instantdisclosure applied for achieving the prescribed objectives, thefollowing detailed descriptions and appended drawings are herebyreferred, such that, through which, the purposes, features and aspectsof the instant disclosure can be thoroughly and concretely appreciated.However, the appended drawings are provided solely for reference andillustration, without any intention to limit the instant disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a cross-sectional, schematic view of the micro touch penstructure according to the first embodiment of the instant disclosure;

FIG. 2 shows an exploded, schematic view of the micro touch penstructure according to the first embodiment of the instant disclosure;

FIG. 3 shows an assembled, schematic view of the micro touch penstructure according to the first embodiment of the instant disclosure;

FIG. 4 shows a partial, cross-sectional, enlarged view taken along thesection line A-A of FIG. 3;

FIG. 5 shows a cross-sectional, schematic view of the micro touch penstructure according to the second embodiment of the instant disclosure;

FIG. 6 shows a cross-sectional, schematic view of the micro touch penstructure according to the third embodiment of the instant disclosure;and

FIG. 7 shows a cross-sectional, schematic view of the micro touch penstructure according to the fourth embodiment of the instant disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment

Referring to FIG. 1, the first embodiment of the instant disclosureprovides a micro touch pen (stylus pen) structure S, comprising: acasing unit 1, a circuit unit 2, a first electromagnetic unit 3, a pencore unit 4, a second electromagnetic unit 5 and an elastic unit 6.

First, the casing unit 1 includes a pen-shaped casing structure 10, andthe circuit unit 2 is disposed inside the pen-shaped casing structure10. For example, the circuit unit 2 includes at least one capacitor 20electrically connected to the circuit unit 2, but it is merely anexample and is not meant to limit the instant disclosure.

Moreover, the first electromagnetic unit 3 is fixed inside thepen-shaped casing structure 10 and electrically connected to the circuitunit 2 through two conductive lines W. The first electromagnetic unit 3includes a first hollow electromagnetic body 30 fixed inside thepen-shaped casing structure 10 and at least one electromagnetic coil 31wound around (disposed around or surroundingly disposed on) the firsthollow electromagnetic body 30 and electrically connected to the circuitunit 2 through the two conductive lines W, and the first hollowelectromagnetic body 30 has a through hole 300. In addition, the pencore unit 4 is movably disposed inside pen-shaped casing structure 10,and the pen core unit 4 includes a first movable portion 41 passingthrough the through hole 300 of the first hollow electromagnetic body30, a second movable portion 42 partially exposed from (or exposedoutside) the pen-shaped casing structure 10, and a stop portion 43 (aretaining ring or a stopper) connected between the first movable portion41 and the second movable portion 42. More precisely, the third diameterd3 of the stop portion 43 is larger than the first diameter d1 of thefirst movable portion 41 and the second diameter d2 of the secondmovable portion 42. For example, the first movable portion 41, the stopportion 43 and the second movable portion 42 are sequentially connectedwith each other to form a single movable pen core structure, and thesingle movable pen core structure may be integrally (integratedly) madefrom non-permeability stainless steel materials.

Furthermore, the second electromagnetic unit 5 includes a secondhollowing electromagnetic body 50 fixed inside the pen-shaped casingstructure 10 and disposed around the first movable portion 41, and thesecond hollowing electromagnetic body 50 is abutted against the stopportion 43 and disposed between the first electromagnetic unit 3 and thestop portion 43. More precisely, the first hollow electromagnetic body30 is larger than the second hollow electromagnetic body 50, and thefourth diameter d4 of the second hollow electromagnetic body 50 islarger than the third diameter d3 of the stop portion 43 for preventingthe magnetic fields generated by the second hollow electromagnetic body50 from being interfered by the stop portion 43. For example, the secondhollow electromagnetic body 50 may be made of high permeabilitymaterials (such as any amorphous materials) by sintering. The secondhollow electromagnetic body 50 also may be formed as a thin flexiblemagnet by mixing magnetic powders and soft gel (glue), thus it is easyto place the second hollow electromagnetic body 50 around the firstmovable portion 41.

Besides, the elastic unit 6 is disposed inside the pen-shaped casingstructure 10 and between the first movable portion 41 and a fixedstructure 7 that is disposed inside the pen-shaped casing structure 10.More precisely, the elastic unit 6 includes at least one elastic element60 (such as a compression spring or an elastic piece) connected betweenthe first movable portion 41 and the fixed structure 7. The at least oneelastic element 60 has a first end 601 and a second end 602 opposite tothe first end 601, the first end 601 of the at least one elastic element60 is connected to the first movable portion 41, and the second end 602of the at least one elastic element 60 is connected to the fixedstructure 7. In addition, the first movable portion 41 has a stopstructure 410 disposed between the first electromagnetic unit 3 and theelastic unit 6. The stop structure 410 is detachably disposed on an endportion 4100 of the first movable portion 41, and the fifth diameter d5of the stop structure 410 is larger than the hole diameter (not labeled)of the through hole 300 of first hollow electromagnetic body 30, forpreventing the first movable portion 41 of pen core unit 4 from beingseparated from the through hole 300 of first hollow electromagnetic body30.

Referring to FIG. 2 and FIG. 4, it is worth mentioning that the microtouch pen structure S further includes a plastic pen head cap 420 thatis a replaceable pen head cap disposed on the second movable portion 42for covering the exposed portion of the second movable portion 42, thusthe aspect of the micro touch pen structure S is enhanced and the usercan use the plastic pen head cap 420 to directly touch a handwrittenboard. More precisely, the second movable portion 42 includes areplaceable pen head cap (such as the plastic pen head cap 420)partially exposed from the pen-shaped casing structure 10 and abuttedagainst the stop portion 43. The replaceable pen head cap 420 has anexposed annular concave portion 4200 disposed on the outer surface ofthe replaceable pen head cap 420. The replaceable pen head cap 420 hasat least two first retaining portions 4201 disposed on the inner surfaceof the replaceable pen head cap 420, and the second movable portion 42has at least two second retaining portions 421 respectively mated withthe at least two first retaining portions 4201. Hence, it is easy forthe user to replace the replaceable pen head cap 420 due to the designof respectively mating the at least two first retaining portions 4201with the at least two second retaining portions 421.

Second Embodiment

Referring to FIG. 5, the second embodiment of the instant disclosureprovides a micro touch pen structure S, comprising: a casing unit 1, acircuit unit 2, a first electromagnetic unit 3, a pen core unit 4, asecond electromagnetic unit 5 and an elastic unit 6. Comparing FIG. 5with FIG. 1, the difference between the second embodiment and the firstembodiment is as follows: in the second embodiment, the first movableportion 41 has an annular concave area 411 adjacent to the stop portion43, and the second hollow electromagnetic body 50 is surroundinglydisposed on the annular concave area 411 of the first movable portion41. More precisely, because the first diameter d1 of the first movableportion 41 is smaller than the second diameter d2 of the second movableportion 42, the fourth diameter d4 of the second hollow electromagneticbody 50 can be reduced for decreasing the thickness of the second hollowelectromagnetic body 50.

Third Embodiment

Referring to FIG. 6, the third embodiment of the instant disclosureprovides a micro touch pen structure S, comprising: a casing unit 1, acircuit unit 2, a first electromagnetic unit 3, a pen core unit 4, asecond electromagnetic unit 5 and an elastic unit 6. Comparing FIG. 6with FIG. 1, the difference between the third embodiment and the firstembodiment is as follows: in the third embodiment, the pen core unit 4includes a first movable portion 41 passing through the first hollowelectromagnetic body 30 and a second movable portion 42 connected to thefirst movable portion 41 and partially exposed from the pen-shapedcasing structure 10. The second hollowing electromagnetic body 50 of thesecond electromagnetic unit 5 is disposed between the firstelectromagnetic unit 3 and the second movable portion 42. The elasticunit 6 includes at least one first elastic element 61 adjacent to thefirst movable portion 41 and at least one second elastic element 62 faraway from the first movable portion 41. The at least one first elasticelement 61 and the at least one second elastic element 62 are connectedin series and between the first movable portion 41 and the fixedstructure 7, and the elastic coefficient of the at least one firstelastic element 61 is smaller than that of the at least one secondelastic element 62.

More precisely, the at least one first elastic element 61 has a firstend 611 and a second end 612 opposite to each other, and the at leastone second elastic element 62 has a first end 621 and a second end 622opposite to each other. The first end 611 of the at least one firstelastic element 61 is connected to the first movable portion 41, thesecond end 612 of the at least one first elastic element 61 and thefirst end 621 of the at least one second elastic element 62 areconnected with each other, and the second end 622 of the at least onesecond elastic element 62 is connected to the fixed structure 7.

Whereby, the micro touch pen structure S of the third embodiment canprovide a two-step press feeling for the user due to the design ofconnecting the at least one first elastic element 61 and the least onesecond elastic element 62. In other words, when the pen core unit 4 ispressed within the range of a predetermined pressure, only the at leastone first elastic element 61 is compressed. When the pen core unit 4 ispressed over the range of a predetermined pressure, both the at leastone first elastic element 61 and the least one second elastic element 62are sequentially or concurrently compressed.

Fourth Embodiment

Referring to FIG. 7, the fourth embodiment of the instant disclosureprovides a micro touch pen structure S, comprising: a casing unit 1, acircuit unit 2, a first electromagnetic unit 3, a pen core unit 4, asecond electromagnetic unit 5 and an elastic unit 6. Comparing FIG. 7with FIG. 5, the difference between the fourth embodiment and the thirdembodiment is as follows: in the fourth embodiment, the pen core unit 4includes a first movable portion 41 passing through the first hollowelectromagnetic body 30, a second movable portion 42 partially exposedfrom the pen-shaped casing structure 10, and a stop portion 43 connectedbetween the first movable portion 41 and the second movable portion 42.

In conclusion, because the design of the pen core unit 4 including afirst movable portion 41 passing through the first hollowelectromagnetic body 30, a second movable portion 42 partially exposedfrom the pen-shaped casing structure 10, and a stop portion 43 connectedbetween the first movable portion 41 and the second movable portion 42,the second hollowing electromagnetic body 50 can be abutted against thestop portion 43 for restricting the position of the second hollowingelectromagnetic body 50.

The above-mentioned descriptions merely represent the preferredembodiments of the instant disclosure, without any intention or abilityto limit the scope of the instant disclosure which is fully describedonly within the following claims. Various equivalent changes,alterations or modifications based on the claims of instant disclosureare all, consequently, viewed as being embraced by the scope of theinstant disclosure.

What is claimed is:
 1. A micro touch pen structure, comprising: a casingunit including a pen-shaped casing structure; a circuit unit disposedinside the pen-shaped casing structure; a first electromagnetic unitfixed inside the pen-shaped casing structure and electrically connectedto the circuit unit, wherein the first electromagnetic unit includes afirst hollow electromagnetic body fixed inside the pen-shaped casingstructure and at least one electromagnetic coil wound around the firsthollow electromagnetic body and electrically connected to the circuitunit; a pen core unit movably disposed inside the pen-shaped casingstructure, wherein the pen core unit includes a first movable portionpassing through the first hollow electromagnetic body, a second movableportion partially exposed from the pen-shaped casing structure, and astop portion disposed between the first movable portion and the secondmovable portion; a second electromagnetic unit including a second hollowelectromagnetic body fixed inside the pen-shaped casing structure anddisposed around the first movable portion, wherein the second hollowelectromagnetic body is fixed to the first movable portion and the stopportion, and is disposed between the first electromagnetic unit and thestop portion; and an elastic unit disposed inside the pen-shaped casingstructure and between the first movable portion and a fixed structurethat is disposed inside the pen-shaped casing structure, wherein thecircuit unit includes at least one capacitor electrically connected tothe circuit unit, and the first hollow electromagnetic body is largerthan the second hollow electromagnetic body, wherein the first movableportion has a stop structure disposed between the first electromagneticunit and the elastic unit, the stop structure is detachably disposed onan end portion of the first movable portion, the first hollowelectromagnetic body has a through hole, and a diameter of the stopstructure is large than a hole diameter of the through hole, and whereinthe second movable portion includes a replaceable pen head cap partiallyenclosed within the pen-shaped casing structure and abutted against thestop portion, the replaceable pen head cap has an exposed annularconcave portion disposed on an outer surface of the replaceable pen headcap, the replaceable pen head cap has at least two first retainingportions disposed on an inner surface of the replaceable pen head cap,and the second movable portion has at least two second retainingportions respectively mated with the at least two first retainingportions.
 2. The micro touch pen structure of claim 1, wherein the firstmovable portion, the stop portion and the second movable portion aresequentially connected with each other to form a single movable pen corestructure, a diameter of the stop portion is larger than a diameter ofthe first movable portion and a diameter of the second movable portion,and a diameter of the second hollow electromagnetic body is larger thanthe diameter of the stop portion.
 3. The micro touch pen structure ofclaim 1, wherein the first movable portion has an annular concave areaadjacent to the stop portion, and the second hollow electromagnetic bodyis surroundingly disposed on the annular concave area of the firstmovable portion, and wherein a diameter of the first movable portion issmaller than a diameter of the second movable portion.
 4. The microtouch pen structure of claim 1, wherein the elastic unit includes atleast one elastic element disposed between the first movable portion andthe fixed structure, the at least one elastic element has a first endand a second end opposite to the first end, the first end of the atleast one elastic element is connected to the first movable portion, andthe second end of the at least one elastic element is connected to thefixed structure.
 5. The micro touch pen structure of claim 1, whereinthe elastic unit includes at least one first elastic element adjacent tothe first movable portion and at least one second elastic element faraway from the first movable portion, the at least one first elasticelement and the at least one second elastic element are disposed inseries and between the first movable portion and the fixed structure,and an elastic coefficient of the at least one first elastic element isdifferent than that of the at least one second elastic element, andwherein the at least one first elastic element has a first end and asecond end opposite to each other, the at least one second elasticelement has a first end and a second end opposite to each other, thefirst end of the at least one first elastic element is connected to thefirst movable portion, and the second end of the at least one secondelastic element is connected to the fixed structure.
 6. A micro touchpen structure, comprising: a casing unit including a pen-shaped casingstructure; a circuit unit disposed inside the pen-shaped casingstructure; a first electromagnetic unit fixed inside the pen-shapedcasing structure and electrically connected to the circuit unit, whereinthe first electromagnetic unit includes a first hollow electromagneticbody fixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit; a pen core unit movablydisposed inside pen-shaped casing structure, wherein the pen core unitincludes a first movable portion passing through the first hollowelectromagnetic body and a second movable portion connected to the firstmovable portion and partially exposed from the pen-shaped casingstructure; a second electromagnetic unit including a second hollowelectromagnetic body fixed inside the pen-shaped casing structure anddisposed around the first movable portion, wherein the second hollowelectromagnetic body is disposed between the first electromagnetic unitand the second movable portion; and an elastic unit disposed inside thepen-shaped casing structure and between the first movable portion and afixed structure that is disposed inside the pen-shaped casing structure,wherein the elastic unit includes at least one first elastic elementadjacent to the first movable portion and at least one second elasticelement far away from the first movable portion, the at least one firstelastic element and the at least one second elastic element areconnected in series and between the first movable portion and the fixedstructure, and an elastic coefficient of the at least one first elasticelement is smaller than that of the at least one second elastic element.7. The micro touch pen structure of claim 6, wherein the circuit unitincludes at least one capacitor electrically connected to the circuitunit, and the first hollow electromagnetic body is larger than thesecond hollow electromagnetic body, wherein the first movable portionhas a stop structure disposed between the first electromagnetic unit andthe elastic unit, the stop structure is detachably disposed on an endportion of the first movable portion, the first hollow electromagneticbody has a through hole, and a diameter of the stop structure is largerthan a hole diameter of the through hole, and wherein the second movableportion includes a replaceable pen head cap partially exposed from thepen-shaped casing structure, the replaceable pen head cap has an exposedannular concave portion disposed on an outer surface of the replaceablepen head cap, the replaceable pen head cap has at least two firstretaining portions disposed on an inner surface of the replaceable penhead cap, and the second movable portion has at least two secondretaining portions respectively mated with the at least two firstretaining portions.
 8. The micro touch pen structure of claim 6, whereinthe at least one first elastic element has a first end and a second endopposite to each other, the at least one second elastic element has afirst end and a second end opposite to each other, the first end of theat least one first elastic element is connected to the first movableportion, the second end of the at least one first elastic element andthe first end of the at least one second elastic element are connectedwith each other, and the second end of the at least one second elasticelement is connected to the fixed structure.
 9. A micro touch penstructure, comprising: a casing unit including a pen-shaped casingstructure; a circuit unit disposed inside the pen-shaped casingstructure; a first electromagnetic unit fixed inside the pen-shapedcasing structure and electrically connected to the circuit unit, whereinthe first electromagnetic unit includes a first hollow electromagneticbody fixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit; a pen core unit movablydisposed inside pen-shaped casing structure, wherein the pen core unitincludes a first movable portion passing through the first hollowelectromagnetic body, a second movable portion partially exposed fromthe pen-shaped casing structure, and a stop portion disposed between thefirst movable portion and the second movable portion; a secondelectromagnetic unit including a second hollow electromagnetic bodyfixed inside the pen-shaped casing structure and disposed around thefirst movable portion, wherein the second hollow electromagnetic body isabutted against the stop portion and disposed between the firstelectromagnetic unit and the stop portion; and an elastic unit disposedinside the pen-shaped casing structure and between the first movableportion and a fixed structure that is disposed inside the pen-shapedcasing structure, wherein the elastic unit includes at least one firstelastic element adjacent to the first movable portion and at least onesecond elastic element far away from the first movable portion, the atleast one first elastic element and the at least one second elasticelement are connected in series and between the first movable portionand the fixed structure, and an elastic coefficient of the at least onefirst elastic element is smaller than that of the at least one secondelastic element.
 10. The micro touch pen structure of claim 9, whereinthe circuit unit includes at least one capacitor electrically connectedto the circuit unit, and the first hollow electromagnetic body is largerthan the second hollow electromagnetic body, wherein the first movableportion has a stop structure disposed between the first electromagneticunit and the elastic unit, the stop structure is detachably disposed onan end portion of the first movable portion, the first hollowelectromagnetic body has a through hole, and a diameter of the stopstructure is larger than a hole diameter of the through hole, andwherein the second movable portion includes a replaceable pen head cappartially exposed from the pen-shaped casing structure and abuttedagainst the stop portion, the replaceable pen head cap has an exposedannular concave portion disposed on an outer surface of the replaceablepen head cap, the replaceable pen head cap has at least two firstretaining portions disposed on an inner surface of the replaceable penhead cap, and the second movable portion has at least two secondretaining portions respectively mated with the at least two firstretaining portions.
 11. The micro touch pen structure of claim 9,wherein the first movable portion, the stop portion and the secondmovable portion are sequentially connected with each other to form asingle movable pen core structure, a diameter of the stop portion islarger than a diameter of the first movable portion and a diameter ofthe second movable portion, and a diameter of the second hollowelectromagnetic body is larger than the diameter of the stop portion.12. The micro touch pen structure of claim 9, wherein the first movableportion has an annular concave area adjacent to the stop portion, andthe second hollow electromagnetic body is surroundingly disposed on theannular concave area of the first movable portion, and wherein adiameter of the first movable portion is smaller than a diameter of thesecond movable portion.
 13. The micro touch pen structure of claim 9,wherein the at least one first elastic element has a first end and asecond end opposite to each other, the at least one second elasticelement has a first end and a second end opposite to each other, thefirst end of the at least one first elastic element is connected to thefirst movable portion, the second end of the at least one first elasticelement and the first end of the at least one second elastic element areconnected with each other, and the second end of the at least one secondelastic element is connected to the fixed structure.
 14. A micro touchpen structure, comprising: a casing unit including a pen-shaped casingstructure; a circuit unit disposed inside the pen-shaped casingstructure; a first electromagnetic unit fixed inside the pen-shapedcasing structure and electrically connected to the circuit unit, whereinthe first electromagnetic unit includes a first hollow electromagneticbody fixed inside the pen-shaped casing structure and at least oneelectromagnetic coil wound around the first hollow electromagnetic bodyand electrically connected to the circuit unit; a pen core unit movablydisposed inside the pen-shaped casing structure, wherein the pen coreunit includes a first movable portion passing through the first hollowelectromagnetic body, a second movable portion partially exposed fromthe pen-shaped casing structure, and a stop portion disposed between thefirst movable portion and the second movable portion; a secondelectromagnetic unit including a second hollow electromagnetic bodyfixed inside the pen-shaped casing structure and disposed around thefirst movable portion, wherein the second hollow electromagnetic body isabutted against the stop portion and disposed between the firstelectromagnetic unit and the stop portion; and an elastic unit disposedinside the pen-shaped casing structure and between the first movableportion and a fixed structure that is disposed inside the pen-shapedcasing structure, wherein the elastic unit includes at least one firstelastic element adjacent to the first movable portion and at least onesecond elastic element far away from the first movable portion, the atleast one first elastic element and the at least one second elasticelement are disposed in series and between the first movable portion andthe fixed structure, an elastic coefficient of the at least one firstelastic element is different than that of the at least one secondelastic element, and wherein the at least one first elastic element hasa first end and a second end opposite to each other, the at least onesecond elastic element has a first end and a second end opposite to eachother, the first end of the at least one first elastic element isconnected to the first movable portion, and the second end of the atleast one second elastic element is connected to the fixed structure.